During which trimester is the supine hypotensive syndrome (aortocaval compression) most likely to occur and why?
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A
First trimester, because hormonal changes dilate blood vessels maximally
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B
Second trimester, because the placenta reaches peak size
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C
Third trimester, because the enlarged uterus compresses the vena cava when supine
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D
Equally likely in all trimesters due to progesterone effects